In 1942, a secret U.S. military program was launched to recruit women to the war effort. But unlike the efforts to recruit Rosie the Riveter to the factory, this clandestine search targeted female mathematicians who would become human 'computers' for the U.S. Army. From the bombing of Axis Europe to the assaults on Japanese strongholds, women worked around-the-clock six days a week, creating ballistics tables that proved crucial to Allied success. Rosie made the weapons, but the female computers made them accurate. When the first electronic computer (ENIAC) was developed to aid the Army's calculation efforts, six of these women were tapped to become its first programmers.